The pictures aren't that great, but there is a huge difference in color in obverse and reverse. Obverse is a greenish color. Reverse is normal silver looking.
I don't know what you mean by the "white balance." These coins are olive green on obverse and regular "nickel" on reverse. Totally different. It's not toning. I've seen toning. My pictures don't show what I can see.
Five cent coins are composed of a homogeneous alloy, there are no layers at all. Your coins have been subjected to oxidation/environmental damage. "White balance" refers to the photos themselves, even the reverses that you say are completely normal have a green hue to them which would be corrected to the normal silvery nickel alloy color with proper white balance in your photos.
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